Marcus grunts a bit as he tears the fleshy tendril from the beast, looking into the tank he watches it...definitely still alive, that's not a problem. He has a feeling that the upwards fleshy goop is probably protecting any form of vitals farther down and so he does the sensible thing, he shoots at the wall of the tank in an attempt to ricochet the bullets into the creatures vitals...if it has any.
"Paw, open up on anything that isn't us or an identified VIP!"